Two class include each other

//Student.h
#include "Courses.h"
#include <vector>
class Student
{
private:
    ...
    vector<Course*> Have_Enrol;
};


// Course.h
#include <vector>
class Student;
class Course
{
private:
    ...
    vector<Student*> S;
public:
    ...
    void addStudent(Student* StuBeAdded);
};